Cold spring 2013 in NW-Europe will last through May.
The Atlantic & North Sea factor. 
Posted: 2. May 2013 (co_8-4): ___ April 2013 ( Box 1 to 6 );  __May 2013 ( Box 7 )  

This paper is a round-up of the winter 2012/13 that received as early as December 2012 high attention, due to an unusual cold-spell around the 20^th December and sea ice in the NE Baltic; HERE. The winter highlight came with March 2013, in some areas or location the coldest for many decades, or up to 200 years, which was thoroughly by us, for example HERE, HERE & HERE, with the attention to raise the awareness of the role the North- and Baltic Sea may have played in the wintry spring.  

As sea water condition remained sub-cold throughout April 2013 in the North Sea and SW Baltic, the climatic condition shall be documented by reference to official reports and temperature maps. As per today (2^nd May) we are aware only of a April 2013 analysis by the ‘Deutscher Wetterdienst ‘ DWD  dated 29/04/13 ( HERE. excerpts):  
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'Urgent' need to see if Arctic affects UK extreme cold? No! MetOffice should investigate the impact of human activities in the North- and Baltic Sea !
Posted: 11. April 2013 (co 9-4)

ITV/UK  (10 Apr.2013) reports:

___The Met Office is calling a meeting of top scientists to look at the "urgent" question of whether the warming of the Arctic is affecting UK weather.  
New Met Office figures out today show that Tuesday 2nd April 2013 was the coldest night since 1917 and, in some areas of the south east, Thursday 4th April 2013 was provisionally the coldest April day since the 1960s.  
Scientists want to investigate whether there is a link between these temperatures and the lowest ever Arctic ice levels, which were recorded a few months ago.  
"If this is how climate change could manifest itself, then we need to understand that as a matter of urgency," Julia Slingo, the Met Office's chief scientist, told ITV News.

 Another report by ITV/UK (10 Apr. 2013) titled: “Met Office investigating Arctic link to record low temperatures in UK ” outlines:

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The cold March 2013 and any anthropogenic contribution
needs to be investigated and explained!  
Material on winter 2012/13 and discussion at :  
02 May 2013: Cold spring 2013 in NW-Europe will last through May. The Atlantic & North Sea factor. (co_8-4)
23. April 2013: Met-Off loose talk on cold March 2013? North and Baltic Sea should not be ignored! (ocl_9-8)
11. April 2013: 'Urgent' need to see if Arctic affects UK extreme cold? No! MetOffice should investigate the impact of human activities in the North- and Baltic Sea ! (co_9-4) 
03 April 2013: Did the cold March 2013 came from Siberia ? A not well founded claim! (ocl_9-9) 
29 March 2013: Cold March 2013 in company with March 1942 & 1917 (co 10-2)  
27. March 2013: Strong Start – Strong Ending; Winter 2012/13. About the Role of North- and Baltic Sea (2007seatraining 1310)
26. March 2013; March 2013 snow in the UK and the North Sea . Did human activities contributed? (ocl 10_2) 
21 March 2013; Cold March 2013 in UK and North Europe science should be able to explain! (ocl_10-3) 
07 March 2013:  Winter 2012/13 for Northern Europe is over! The Baltic and North Sea will prevent a surprise in March! (ocl-10_4)
19. January 2013: Northern Europe's bulwark against Asian cold from 19-31. (oc_12-8)
14. January 2013: North- and Baltic Sea influence Europe ’s winter 2012/2013 until now. (ocl_12_6) 
09 December 2012 (+ 21 & 26 Dec) : Are we heading to severe Baltic Sea ice conditions by 30th December 2012? (2007seatraining)